using System;
using DynamicExpresso;
using Ichni.Story;
using UnityEngine;

namespace Ichni.Story
{
    public static partial class StoryInterpreters
    {
        public static readonly Interpreter FunctionInterpreter;
        public static readonly Interpreter ConditionInterpreter;
        
        static StoryInterpreters()
        {
            FunctionInterpreter = new Interpreter();
            ConditionInterpreter = new Interpreter();
            
            SetFunctionInterpreter();
            SetConditionInterpreter();
        }
        
        static void SetFunctionInterpreter()
        {
            FunctionInterpreter.SetFunction("GetGlobalVariable", new Func<string, int>(GetGlobalVariable));
        }

        static void SetConditionInterpreter()
        {
            ConditionInterpreter.SetFunction("GetGlobalVariable", new Func<string, int>(GetGlobalVariable));
        }
    }

    public static partial class StoryInterpreters
    {
        /// <summary>
        /// 获取全局变量的值
        /// </summary>
        static int GetGlobalVariable(string variableName)
        {
            if (StoryManager.instance.globalVariables.TryGetValue(variableName, out int value))
            {
                return value;
            }

            throw new ArgumentException($"Global variable '{variableName}' not found.");
        }
    }
}